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model T conversion help please

2244 Views 34 Replies 9 Participants Last post by  Duncan
I started with a 23 T where the engine needed rebuild. I was offered this 300 lb caterpillar forklift motor ,sweet spot 1800 rpm ,series wound motor that i have mounted in the car,direct drive no clutch engine plate is shown it came from a 15 000 caterpillar forklift machine. the T nets out at 1500lb with the ice components removed original speed 35 mph at 1500 rpm. the electrics should balance out to 1500 pounds aftermarket disc brakes stop like a normal car.
I have run the motor direct drive to the driveshaft at 750 rpm on a `12 volt battery . I am anticipating 48 volts to give me just over 35 mph of 50 Km/hr this is a much as I wish to go on 100 yr old wooden wheels.
the batteries are nominal 48 volt from a bmw 130i which at 3500 lbs gave a 200 mile range. there are 8 units 4 under the floor as shown and two under the front seat replacing the gas tank ,two under the back seat cushion.
I have watched the videos from benjamin nelson, scotty vw van and garcia vw van.
nelson and scotty are using lead acid batteries.
The motor i got from a forklift mechanic who now being self employed has no time. a second tech said the same thing and a third does not want the liability. i found an octogenarian who has built 4 electric vehicles SLA and does not want the unknown liability of working with Lithium . the new crop of enthusiasts want AC motors regen and computer algorithms.
I have a main contactor, throttle box. 48 volt 12 volt converter throttle pedal and hydraulic brake pedal mounted to the front floorboard.
i bought a forklift that has a suppex motor and controller that are not compatible with a series wound motor.
I am acutely aware of the need for compatible components.
what i need is for someone to tell me what model controller to buy as well the bits and pieces. what i don't want to do is acquire bits and pieces from various sources that are not compatible. the choices are dizzying. i can sorta figure it out but lack the assurance that my thinking is correct.
I am well aware of what i can fabricate but humble enough to admit my limitations.
I live in the niagara falls canada area. [email protected] 905 9888648

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The wilwood engineer tells me the system is designed to stop a 4500 lb vehicle at 60 mph in a panic stop I am 1500 lbs and doing 30 mph. he told me not to worry I am overbuilt .
The siemens automotive engineer explained there are two parts to this discussion. getting the wheels to stop turning on the car which the disc brakes will do without pause.
The Wilwood engineer is correct with regard to stopping.
The Siemens engineer said there were two parts; getting the wheels to stop is one, and what was the second?

My concern is that you now have a two-wheel hydraulic brake system with minimal fluid volume. The fluid only needs to hit 270 C/ 518 F to boil, and you lose the ability to stop. Holding a set speed on a downhill run for an extended period will heat brakes more than a highspeed panic stop. This is because, in a panic stop, the brakes have an opportunity to lose heat after you are stopped. With continued braking, the heat keeps building and can easily overwhelm the capacity (mass) of the brake disc to lose that heat. The 600-foot figure, I assume, is the elevation change. I was unable to find where you mention the distance over which you descend the 600 feet in any of your posts. Could you please let us know? Is it one continuous run, or are there stops along the way? What is the speed limit or desired maximum speed for the descent?
The engineers you spoke with took into account the speed and weight of the vehicle. I would suggest you consider a worst-case scenario. The number of occupants x the average weight of an adult male in your region + the estimated weight of the finished vehicle = Maximum Total Weight to be used when calculating the required mass for the brake discs.

In a modern car, you can rub the tires against the curb to scrub off speed, an option you don't have with wooden wheels.
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